Dyson Pure Hot + Cool Link Purifier Heater has triple functionality. As a purifier, it removes 99.97% of allergens as small as 0.3 microns from your home automatically monitoring and reacting. It then reports to the Dyson Link app so you can remotely control your environment. As a heater or cooling fan, it lets you select personal mode for a powerful stream of focused air or diffused mode for wide projection.